https://hdl.handle.net/20.500.12367/2206 Sun, 07 Jun 2026 18:17:39 GMT 2026-06-07T18:17:39Z https://hdl.handle.net/20.500.12367/3241 EV hybrid battery with integrated multilevel neutral-point-clamped interfacing and lossless intermodule state-of-charge balancing Garcia-Rojas, Gabriel; Busquets-Monge, Sergio; Filba-Martinez, Alber; Sarıkurt, Türev; Alepuz, Salvador; Bordonau, Josep The battery is at the heart of the electric vehicle and determines many of its key performance features. Therefore, an optimized design of the battery is critical. On the one hand, the design of batteries based on a single battery cell leads in many cases to oversized batteries in terms of energy or power, due to the diversity of requirements of the different electric vehicles. On the other hand, the use of a custom cell for each vehicle, optimized for its particular requirements, is not economically viable. Instead, hybrid batteries, combining only two battery cell chemistries, with distinct particular strengths, such as high specific energy or high specific power, offer an opportunity to cover a wide range of vehicle battery specifications while avoiding oversizing and dispersion in the cells to be employed. [...] Wed, 01 Jan 2025 00:00:00 GMT https://hdl.handle.net/20.500.12367/3241 2025-01-01T00:00:00Z https://hdl.handle.net/20.500.12367/3226 Multibattery charger system based on a multilevel dual-active-bridge power converter Campos-Salazar, José M.; Busquets-Monge, Sergio; Filba-Martinez, Alber; Alepuz, Salvador This work introduces a novel battery charger implemented with a four-level three-phase neutral-point-clamped converter and a four-level single-phase dual-active-bridge converter, which offers the intrinsic advantages of multilevel conversion, provides galvanic isolation and allows bidirectional power flow. A detailed and extensive modeling of the system is developed, together with the design of appropriate closed-loop control and modulation. The proposed system allows individual charging of each battery pack, ensuring that the full capacity of the battery bank is utilized, even when the battery packs have different state-of-charge levels, differ in nominal capacities, or use different chemistries. Furthermore, the proposed control system manages the overall DC-link voltage and ensures voltage balance across both DC-links in the system. The effectiveness of the proposed system configuration and control has been validated through simulations. [...] Sat, 19 Apr 2025 00:00:00 GMT https://hdl.handle.net/20.500.12367/3226 2025-04-19T00:00:00Z https://hdl.handle.net/20.500.12367/2843 Electric vehicle powertrains with modular battery banks tied to multilevel NPC inverters Busquets-Monge, Sergio; Alepuz, Salvador; Garcia-Rojas, Gabriel; Bordonau, Josep Nowadays, the internal combustion engine in vehicles is being replaced by electric motors, giving way to the electric vehicle, which results in reduced environmental impact, higher efficiency and lower emission of greenhouse gases. The powertrain of an electric vehicle is its most prominent subsystem, with the batteries and traction inverter being key components. Thus, due to their relevance, advances in the design of both components are of paramount importance. In this paper, the potential benefits achieved through a powertrain design approach based on combining a modular battery bank with multilevel NPC traction inverter topologies were analyzed, in comparison to a conventional two-level powertrain design. Several aspects were analyzed: modularity, complexity, battery-pack state-of-charge balancing, inverter loss, motor ac voltage harmonic distortion, motor common-mode voltage and reliability. [...] Sun, 01 Jan 2023 00:00:00 GMT https://hdl.handle.net/20.500.12367/2843 2023-01-01T00:00:00Z https://hdl.handle.net/20.500.12367/2836 Active thermal control in neutral-point-clamped multilevel converters based on switching-cell arrays Alepuz, Salvador; Nicolas-Apruzzese, Joan; Rafiezadeh, Roya; Busquets-Monge, Sergio; Raya Di Francisco, Mariana Candela; Filba-Martinez, Alber Neutral-point-clamped multilevel converters are a suitable solution to the implementation of low–medium voltage and power applications at present, thanks to their intrinsic superior voltage and current quality. The conventional configurations of these converters present uneven power loss distribution, causing thermal stress in some power semiconductors, which weakens the power converter reliability. To overcome this, an implementation of the neutral-point-clamped multilevel converter based on a switching-cell array is introduced, adding redundant conduction paths on one side and more options to distribute the switching losses on the other side. An active thermal control is proposed to balance the temperature distribution in the converter. A four-level converter has been implemented to evaluate the proposed solution. [...] Sun, 01 Jan 2023 00:00:00 GMT https://hdl.handle.net/20.500.12367/2836 2023-01-01T00:00:00Z